The shifts of bird song frequencies in urbanized areas provide a unique system to understand avian acoustic responses urbanization. Using passive monitoring and automatic sound recognition technology, we explored the frequency variations six common urban species their associations with habitat structures. Our results demonstrated that were significantly higher than those peri-urban rural areas. Anthropogenic noise structure identified as crucial factors shaping space for birds. We found...

Most text classification models based on traditional machine learning algorithms have problems such as curse of dimensionality and poor performance. In order to solve the above problems, this paper proposes a model fastText. Our explores important information contained in through feature engineering, obtains low-dimensional, continuous high-quality representation fastText algorithm. The experiment is Python classify dataset "user comment data emotional polarity judgment" Baidu Dianshi...

Pine wilt disease (PWD), caused by pine wood nematode (PWN), poses a tremendous threat to global forests because it can result in rapid and widespread infestations within months, leading large-scale tree mortality. Therefore, the implementation of preventive measures relies on early detection PWD. Unmanned aerial vehicle (UAV)-based hyperspectral images (HSI) detect tree-level changes are thus an effective tool for forest change detection. However, previous studies mainly used single-date...

The invasive pest Dendroctonus valens has spread to northeast China, causing serious economic and ecological losses. Early detection disposal of infested trees is critical prevent its outbreaks. This study aimed evaluate the potential an unmanned aerial vehicle (UAV)-based hyperspectral image for early D. infestation at individual tree level. We compared spectral characteristics Pinus tabuliformis in three states (healthy, dead), established classification models using groups features...

Abstract Intensified human activities have been seriously threatening the structure and ecological processes of ecosystems, resulting in habitat degradation. Therefore, coordinating coupling between quality (HQ) is crucial for high‐quality sustainable regional development well‐being. This study evaluated HQ Pearl River Delta (PRD) urban agglomeration China from 2000 to 2020 using footprint index (HFI) integrated valuation ecosystem services tradeoffs model. Then, we employed bivariate...

In recent years, the red turpentine beetle (RTB) (Dendroctonus valens LeConte) has invaded northern regions of China. Due to short invasion time, outbreak tree mortality corresponded a low level damage. Important information about mortality, provided by remote sensing at both single-tree and forest stand scale, is needed in management early stages outbreak. order detect RTB-induced we evaluated classification accuracies Gaofen-2 (GF2) imagery different spatial resolutions (1 4 m) using...

The red turpentine beetle (Dendroctonus valens LeConte) has caused severe ecological and economic losses since its invasion into China. It gradually spreads northeast, resulting in many Chinese pine (Pinus tabuliformis Carr.) deaths. Early detection of D. infestation (i.e., at the green attack stage) is basis control measures to prevent outbreak spread. This study examined changes spectral reflectance after initial attacking valens. We also explored possibility detecting early based on...

Abstract Forest stands of Pinus yunnanensis Franch in southwestern China are seriously damaged by several bark living insect pests. These pests commonly exist the same host tree and exploit limited phloem resources. In this study, we hypothesized that sympatric would occupy different ecological niches to reduce interspecific competition, their coordinated attack aggravate vigor decline P. . To quantify niches, used a sampling method involving three dimensional divisions resource states: (a)...

The dosage of coagulant plays a critical role in ensuring effluent quality, however the complexity chemical theory and affected by many factors (turbidity, pH, conductivity, flow rate, etc.) that it is difficult to determine optimal effectively. Optimization wastewater treatment becoming more as water quality standards become increasingly stringent. In previous studies, usually build prediction model only use current parameters time sequence were ignored, result accuracy not satisfactory....

The red turpentine beetle, Dendroctonus valens LeConte (Coleoptera: Scolytidae), was found for the first time in China Yangcheng and Xinshui counties, Shanxi province 1998, Hebei 1999. beetle mostly attacks oil pine Pinus tabulaeformis Carriére. By 2003 85 counties of three provinces north area infested forests covered more than 700,000 ha. elevation above sea level is 800 m. beetles most frequently attack trees on hilltops at forest edge, fewer occur centre stand. This correlates with...

Outbreaks of pine shoot beetles (Tomicus spp.) have caused widespread tree mortality in Southwest China. However, the understanding role climatic drivers beetle outbreaks is limited. This study aimed to characterize relationships between climate variables and forests Yunnan (Pinus yunnanensis Franch) The beetle-infested total area from 2000 2017 was extracted multi-data Landsat images obtained field survey plots. A temporal prediction model developed by partial least squares regression....

The mutualistic symbiosis relationship between the gut microbiome and their insect hosts has attracted much scientific attention. native woodwasp, Sirex nitobei, invasive European noctilio, are two pests that infest pines in northeastern China. Following its encounter with species, however, there is a lack of research on whether S. noctilio changed, what causes contributed to these alterations, changes were more conducive colonization. We used high-throughput metatranscriptomic sequencing...

Abstract To effectively promote the development of digital economy, we have proposed a new construct algorithm economy innovation system. It mainly researches four indicators: subject, resources, efficiency and environment. The quality synthesis index in recent years is calculated through entropy method. further analyse main factors affecting quality, grey relation analysis method adopted. Besides, prediction model established to predict future trend economy. Based on data collected from...

The adaptive strategies of bird song frequencies in urbanized areas provide a unique system to understand the sounds response conditions. Using passive acoustic monitoring and automatic sound recognition technology, we explored frequency variations six common urban species their association with habitat structures. Our results demonstrated that environments were significantly higher than outskirts rural areas. Habitat vegetation structure noise levels identified as crucial factors shaping...

The rapid development of general aviation leads to many problems in air traffic management. efficient and accurate flight trajectory prediction is the key technology improve safety management efficiency flight. Aiming at problem that communication signal flying low altitude affected by factors such as mountains buildings, this paper proposes a short-term method based on log short term memory (LSTM) adding characteristics displacement adjacent moments basis real-time data aircraft. results...

Abstract At present, China’s economy is continuously developing and making progress. The deep integration of society big data artificial intelligence other technologies constantly promoting the construction new smart cities. major livelihood service systems have provided great convenience to people. same time, they accumulated massive data. Mining value solve people’s main problems has been widely concerned by government community. However, structure each system different. noisy cannot be...

In order to make full use of the information contained in data, improve accuracy identification and classification fishing vessel operation type, this paper transformed problem for type into multi based on Feature Fusion. Extracting knowledge from multi-source heterogeneous data that is beneficial target tasks, fusion processing at feature level identificating Based Beidou VMS system, it combined with policies documents relevant fishery regulatory authorities, extracted constructing space...

In order to make rational use of the resources about epidemic prevention such as masks, and prevent leaders enterprises from falsely reporting number workers back work, evaluation work in is transformed into prediction under different distribution work. Based on analysis existing historical data, this paper predicts people who return through intelligent algorithm, so that government can prepare distribute materials. daily power consumption data enterprise, combined with returning constructs...

In a innovation ecosystem, there are many value niches to different companies. And relationships between each niche. Besides this, stereoscopic system, still complex and stereo net works. most papers, the ecosystem in levels, just like country, region or company, have been researched, which focus on elements of innovational them plane. But, systems not plane style can evolve fact. So, this paper, new transform algorithm is proposed, based networks. we believe that probability rate niches....